A cargo ship, the MV Mariner, was unloaded at the Vandenberg Air Force Base dock, April 6. The MV Mariner made its way from a production facility in Decatur, Ala., to deliver a United Launch Alliance Delta IV rocket.

Various Air Force personnel were on site at Vandenberg's only dock, which solely exists to accommodate the Mariner's rocket deliveries. The Delta IV rocket is delivered by boat due to its massive size inhibiting other forms of travel.

A cargo ship, the MV Mariner, was unloaded at the Vandenberg Air Force Base dock, April 6. The MV Mariner made its way from a production facility in Decatur, Ala., to deliver a United Launch Alliance Delta IV rocket.

Various Air Force personnel were on site at Vandenberg's only dock, which solely exists to accommodate the Mariner's rocket deliveries. The Delta IV rocket is delivered by boat due to its massive size inhibiting other forms of travel.

Check out this time-lapse of the arrival and offloading!

I saw the CBC unloaded, and the two halves of a payload fairing. There was also a large container unloaded. Did this contain the 5-meter diameter DCSS?

Also, this launch campaign will be the last for a Delta IV Medium from Vandenberg/SLC-6.

The symbols look like fleurs-de-lis. There are five of them which could correspond to the fifth satellite in a series. Specifically Topaz, which is the only satellite that has ever used the Delta IVM+(5,2). The swing of the knight's sword looks like the retrograde orbit these spacecraft operate in.

There are quite a few launches scheduled in the back half of the year, many of them SpaceX. Seems like the range will be quite busy and it might not take much for launches to start slipping due to conflicts.

Unless you have data to suggest the delay is due to lack of capability on ULA's side, there's no good reason to assume it is that I am aware of.